The pressure of a liquid flow is raised by a pump driven by

The pressure of a liquid flow is raised by a pump driven by an electrical motor. Identify the interactions treating the pump as an open system. Select all that apply. Work Transfer negative Heat Transfer positive Work Transfer positive Mass Transfer Heat Transfer negative Identify the interactions treating the pump and the motor as a combined system. Select all that apply. Work Transfer positive Heat Transfer positive Heat Transfer negative Work Transfer negative Mass Transfer

Solution

Part A

since pump is doing work on the system hence it is negative and work transfer

Part B

It is also doing work on the system

so negative and work transfer